#define _CRT_SECURE_NO_WARNINGS 1
class Solution {
public:
    bool vis[300][300];
    int dx[4] = { 0,0,1,-1 };
    int dy[4] = { 1,-1,0,0 };
    int m, n;
    int ret;
    int numIslands(vector<vector<char>>& grid) {
        m = grid.size(), n = grid[0].size();
        for (int i = 0; i < m; i++)
        {
            for (int j = 0; j < n; j++)
            {

                if (grid[i][j] == '1' && vis[i][j] == false)
                {

                    cout << i << ' ' << j << ' ' << grid[i][j] << endl;
                    vis[i][j] = true;
                    dfs(grid, i, j);
                    ret++;
                }
                cout << vis[i][j] << ' ';
            }
        }
        return ret;
    }
    void dfs(vector<vector<char>>& grid, int i, int j)
    {
        for (int k = 0; k < 4; k++)
        {
            int x = i + dx[k], y = j + dy[k];
            if (x >= 0 && x < m && y >= 0 && y < n && !vis[x][y] && grid[x][y] != '0')
            {
                vis[x][y] = true;
                dfs(grid, x, y);
            }
        }
    }
};